Keep non-chat models out of the chat lists

app/MindWork AI Studio/Provider/Google/ProviderGoogle.cs

@@ -168,9 +168,15 @@ public class ProviderGoogle() : BaseProvider(LLMProviders.GOOGLE, new Uri("https
         {
             Models =
             [
+                //
+                // Asking what a model is made for, rather than only ruling out the embedding ones.
+                // Google names everything after the chat model it grew out of, so the catalog is
+                // full of names which look like something to talk to and are not: the image models,
+                // and the computer use model whose API refuses a request without its tool.
+                //
                 ..result.Models.Where(model =>
                         model.Id.StartsWith("gemini-", StringComparison.OrdinalIgnoreCase) &&
-                        !model.IsEmbeddingModel())
+                        model.IsChatModel())
                     .Select(this.WithDisplayNameFallback)
             ]
         };

app/MindWork AI Studio/Provider/ModelKind.cs

@@ -76,6 +76,16 @@ public enum ModelKind
     /// </remarks>
     REALTIME,
 
+    /// <summary>
+    /// The model drives a computer: it looks at a screen and says what to click next.
+    /// </summary>
+    /// <remarks>
+    /// These refuse a plain conversation outright. Google's answer to a request without the computer
+    /// use tool is "This model requires the use of the Computer Use tool", so the model belongs in no
+    /// chat list, however much its name looks like the chat model it grew out of.
+    /// </remarks>
+    COMPUTER_USE,
+
     /// <summary>
     /// The model extracts text from images or scanned documents.
     /// </summary>

app/MindWork AI Studio/Provider/X/ProviderX.cs

@@ -79,7 +79,12 @@ public sealed class ProviderX() : BaseProvider(LLMProviders.X, new Uri("https://
         var result = await this.LoadModels(SecretStoreType.LLM_PROVIDER, ["grok-"], apiKeyProvisional, token);
         return result with
         {
-            Models = [..result.Models.Where(n => !n.Id.Contains("-image", StringComparison.OrdinalIgnoreCase))]
+            //
+            // Asking what a model is made for rather than testing its name for a word. The word was
+            // "-image", which said nothing about grok-imagine-video: that one made films and stood
+            // in the list of things to chat with.
+            //
+            Models = [..result.Models.Where(model => model.IsChatModel())]
         };
     }